That is a very good question..to which only Microsoft has the answer!:-) In the meantime, suffice it to say that every once in awhile, Visio loses track of your Glue/SnapTo settings which you'll need to restore. Here's what to do: 1. In Visio, navigate to "Home", open "View", expand "Visual Aids"2. Once in "Visual Aids", Check or Re-Check the "Glue"box. 3. Under the "Snap To" category, be sure shape intersections, shape handles, shape vertices, and connection points are all checked. 4. Under the ......